In the Create Lab, you can create a material from one or several images or by mixing materials.
On the right bar, you have the Layer stack and the Export panel to export the current material displayed in the 2D view.
Capture based workflows
By importing one or several images, you will see the Material Creation Template:
Bitmap to Material: It will create a material from one image
Multiangle to Material: It will create a material from 2 to 8 images taken under specific light conditions
Use as bitmap: It will allow you to process and modify your images in Substance Alchemist before creating a material
For Use as Bitmap workflow, you have to switch to the 2D view and the scanX output to see your image(s)